Ring binder



FIG. 1 is a perspective view of a ring binder showing my new design, the release mechanism depicted by means of broken lines being for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a perspective view of my new design with a second type of release mechanism depicted by means of broken lines for illustrative purposes only and forming no part of the claimed design;

FIG. 3 is a side elevational view of FIG. 1, the opposite side being a miror image thereof;

FIG. 4 is a top plan view of FIG. 1;

FIG. 5 is a bottom plan view of FIG. 1; and,

FIG. 6 is an end elevational view of FIG. 1, the opposite end being a mirror image thereof. 

The ornamental design for a ring binder, as shown and described. 